This IS awkward. Also, way to act like a child about something naturally occurring and obvious on these animals. You sound like you’re about six years old. (Hint: if you’re not willing to deal with glimpses of animal genitalia from time to time, animal sites generally aren’t for you.)

Heh, seasoned rat owners have probably seen more than one photo like this. Male rats’, er… “boys” are rather large because rats evolved to mate as often as possible to pass on their genes, and they’re rather noticeable at the best of times.